[jira] [Created] (CASSANDRA-12027) Provide metrics for thread pool heap and CPU usage

["Robert Stupp (JIRA)" <ji...@apache.org>]

Robert Stupp created CASSANDRA-12027:
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             Summary: Provide metrics for thread pool heap and CPU usage
                 Key: CASSANDRA-12027
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12027
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Robert Stupp
            Assignee: Robert Stupp
            Priority: Minor
             Fix For: 3.x


While working on some load tests and digging through the causes of certain things, it was very useful to know which thread pools actually consume how much heap and CPU.

I already have some general implementation in place, but this assumes that the thread names stay constant. CASSANDRA-11966 is about to change this, so the general approach no longer works. Instead, measuring CPU and heap usage would need to be accumulated in SEPWorker for the actual (logical) thread pool.

Purpose of this ticket is to provide the following metrics:
* CPU and heap usage per statically named C* thread
* CPU and heap usage per non-shared C* thread pool
* CPU and heap usage per shared C* thread pool
* CPU and heap usage for Netty thread pools

This information would be exposed as "ordinary" metrics.



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